Engine knock sound

2008 NISSAN ALTIMA
110,000 MILES • 2.5L • 4 CYL • 2WD • AUTOMATIC
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https://youtu.be/tSAACujlIQQ.
I posted the link to show you the noise since I can't describe the noise. Happens when the car is running, every 30-45 seconds or so. Also happens after shutting the car off for about 20 minutes after the car is turned off, every 30-45 seconds also.
Aug 6, 2019 at 11:33 PM
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KASEKENNY
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Hi,

Is this noise happen at the 8 second mark of the video? I can't really hear anything if it happens some other time. The video helps but can you take a video so that we can hear the noise a couple times? Also, pop the hood and take it from under the hood or at least try to locate where it seems to be coming from. Thanks
Aug 7, 2019 at 4:13 PM